Octave Audio offers what they call a “Black Box” and “Super Black Box” which contain additional power supply capacitance. They included the Black Box with the V 110 SE for me to try out. It has four times as much capacitance as the amplifier does, and the MSRP is $1,200 USD. It does not reduce distortion or increase the power output from what I found in bench tests, but is claimed to have subtle effects on the sound and improves performance with hard-to-handle-speakers. The reason it does not increase power output is that the power is controlled by the input transformer’s current capability. Also, the tubes themselves have limited plate dissipation that cannot be increased. The effectiveness of the Black Box and Super Black Box on sound quality is something that needs to be determined with double-blind tests.
Audiophilepure 
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